Time-resolved coherent anti-Stokes Raman spectroscopy and the measurement of vibrational spectra in shock-compressed molecular materials

David S. Moore; Stephen C. Schmidt

doi:10.1117/12.22091

1 December 1990 Time-resolved coherent anti-Stokes Raman spectroscopy and the measurement of vibrational spectra in shock-compressed molecular materials

David S. Moore, Stephen C. Schmidt

Author Affiliations +

Proceedings Volume 1318, Optical Spectroscopic Instrumentation and Techniques for the 1990s: Applications in Astronomy, Chemistry, and Physics; (1990) https://doi.org/10.1117/12.22091
Event: Optical Spectroscopic Instrumentation and Techniques for the 1990s: Applications in Astronomy, Chemistry, and Physics, 1990, Las Cruces, NM, United States

Abstract

We present the use of coherent anti-Stokes Raman scattering (CARS) in conjunctiOn with a two-stage light-gas gun to obtain vibrational spectra of shock-compressed liquid N2, 02, CO. and their mixtures. The experimental spectra are compared to spectra calculated using a semiclassical model for CARS intensities to obtain vibrational frequencies, peak Raman susceptibilities, and linewidths. The derived spectroscopic parameters suggest thermal equilibrium of the vibrational populations is established in less than a few nanoseconds after shock passage. Vibrational temperatures obtained are compared to those derived from equation-of-state calculations. Shifts in the vibrational frequencies reflect the influence of increased density and temperature on the intramolecular motion.

Citation Download Citation

David S. Moore and Stephen C. Schmidt "Time-resolved coherent anti-Stokes Raman spectroscopy and the measurement of vibrational spectra in shock-compressed molecular materials", Proc. SPIE 1318, Optical Spectroscopic Instrumentation and Techniques for the 1990s: Applications in Astronomy, Chemistry, and Physics, (1 December 1990); https://doi.org/10.1117/12.22091

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